This is for a listing of events or exercises - one column will be whether this is a day, night, or both/either type of event, observation, or exercise. So this word I'm looking for would mean its "day-or-nightness". Tks for any help.

This is for a listing of events or exercises - one column will be whether this is a day, night, or both/either type of event, observation, or exercise. So this word I'm looking for would mean its "day-or-nightness". Tks for any help.